Jesus Gil Fernandez's research while affiliated with Netherlands Space Office and other places

Publications (10)

Article
This paper presents an on-board, centralized autonomous navigation algorithm able to reconstruct the trajectories of a fleet of CubeSats relative to an asteroid binary system. The algorithm is executed on-board the main spacecraft, which takes relative measurements using a narrow optical camera and an additional relative measurement, being inter sa...
Conference Paper
Full-text available
The estimation of the relative pose of an inactive spacecraft by an active servicer spacecraft is a critical task for close-proximity operations, such as In-Orbit Servicing and Active Debris Removal. Among all the challenges, the lack of available space images of the inactive satellite makes the on-ground validation of current monocu-lar camera-bas...
Conference Paper
This paper presents an on-board, centralized autonomous navigation algorithm able to reconstruct the trajectories of a fleet of CubeSats relative to an asteroid binary system. The algorithm is executed on-board the main spacecraft, which takes relative measurements using a narrow optical camera and an additional relative measurement, being inter sa...
Conference Paper
Full-text available
This paper introduces a novel framework which combines a Convolutional Neural Network (CNN) for feature detection with a Covariant Efficient Procrustes Perspective-n-Points (CEPPnP) solver and an Extended Kalman Filter (EKF) to enable robust monocular pose estimation for close-proximity operations around an uncooperative spacecraft. The relative po...
Conference Paper
Full-text available
This paper reports on a comparative assessment of Image Processing (IP) techniques for the relative pose estimation of uncooperative spacecraft with a monocular camera. Currently, keypoints-based algorithms suffer from partial occlusion of the target, as well as from the different illumination conditions between the required offline database and th...
Conference Paper
TIRI is a multi-purpose Thermal InfraRed (TIR) Imager, initially designed for the Asteroid Impact Mission, an ESA Technology Mission of Opportunity targeting Didymos, a binary near–Earth asteroid. TIRI is conceived to pursue scientific and technology development goals. It will be used to determine asteroid surface physical parameters, such as tempe...
Article
Roger Walker and colleagues consider the potential for sending nanospacecraft into deep space.
Article
Full-text available
In the frame of Near-Earth-Object exploration and planetary defence, the two-part AIDA mission is currently studied by NASA and ESA. Being composed of a kinetic impactor, DART (NASA), and by an observing spacecraft, AIM (ESA), AIDA has been designed to deliver vital data to determine the momentum transfer efficiency of a kinetic impact onto a small...
Article
Full-text available
The internal structure of asteroids is still poorly known and has never been analyzed directly by measurements. Our knowledge relies entirely on inferences from remote sensing observations of the surface and theoretical modeling. Direct measurements are crucial to characterize an asteroid's internal structure and heterogeneity from sub-metric to gl...

Citations

... Artificial uncooperative targets are here considered, being the most challenging scenario and constraining towards a robust solution leaning on the chaser capabilities only: in that direction, imaging with passive sensors is the best option to collect meaningful measurements. Solutions related to visible (VIS) cameras have been widely studied and practically applied in the context of uncooperative/cooperative rendezvous [1][2][3]. However, visible imaging strongly depends on illumination conditions as can be noticed in Fig. 1 from [4], where the Tango spacecraft is only partially visible (inside the red circle) with low contrast with respect to the background. ...
... Vision-based navigation is becoming the most prominent solution for autonomous navigation for different scenarios [1][2][3][4]. Moreover, activities linked to the Lunar Gateway and Lunar villages have created a deep interest in the lunar environment [5][6][7]. ...
... Nevertheless, a potential solution to the model unavailability is the 3D keypoints recovery preparatory step. Finally, Pasqualetto et al. [69] investigated the potentials of using a hourglass neural network to extract the corners of a target spacecraft prior to the pose estimation. In this method, the output of neural network is a set of so called heatmaps around the features used in the offline training. ...
... Preliminary results on the network performance were already reported in Ref. [22]. Above all, one key advantage of relying on CNNs for feature detection was found in the capability of learning the relative position between features under a variety of relative poses present in the training. ...
... Among these classes of platforms, the CubeSat standard has become extremely popular. Nano-satellite constellations in low-Earth orbit (LEO) are becoming a reality, while the scientific and industrial community is exploring applications of nano-satellites for interplanetary missions [16]. These, represents new challenges compared to LEO missions, such as surviving in a harsher space environment, communicating with Earth from a greater distance, achieving accurate pointing without exploiting the magnetic fields of celestial bodies, and performing accurate orbital maneuvers. ...
... In 2018, a decimeter-sized hopper MINERVA-II 12 successfully traveled about 800 m on the surface of asteroid Ryugu, whose liftoff is triggered by a flywheel's torque (similar to Cubli 41 ). Since MINERVA-II has only a limited budget, 12 its upgraded generations 42,43 have already been planned by several space agencies. ...
... JuRa (for Juventus Radar) will be devoted to the first investigation of a binary asteroid interior. The radar is a monostatic synthetic aperture radar operating at low frequency to sound the asteroid interior, with heritage from the radar developments done in the context of the AIM mission (Herique et al. 2018(Herique et al. , 2019. JuRa transmits a Binary Phase Shift Keying (BPSK) coded signal with a 20 MHz bandwidth, a 60 MHz carrier, and 5 W peak power. ...